Investigate biomejs's suggested fixes for nullable things

[samuel-skean]

Specifically https://biomejs.dev/linter/rules/no-non-null-assertion/.
I don't think I agree with what they're suggesting. What I want is for the code to throw an exception whenever the thing is null. I think using ! to assert that something is not-null does this as well as can be hoped.

• What does biomejs's suggested (unsafe) fix do?
• How can we configure it to do what I want, on a project-wide basis?